Chemical interaction between EVA and Portland cement hydration at early-age
Chemical interaction between EVA and Portland cement hydration at early-age
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DOI：
10.1016/j.conbuildmat.2009.06.033
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发表时间：
2009-11-01
影响因子：
7.4
通讯作者：
Pileggi, R. G.
中科院分区：
文献类型：
--
作者：
Betioli, A. M.;Hoppe Filho, J.;Pileggi, R. G.
乙烯/醋酸乙烯酯（EVA）共聚物。作为乳胶或可再分散粉末，添加到砂浆和混凝土中以提高断裂韧性、抗渗性和与各种基材的粘结强度。经过一天的水合作用后，物理和化学相互作用已经得到证实，但在第一个小时内，仅确定了物理相互作用和一些化学相互作用的证据。本文的目的是在热重分析中评估 EVA 和波特兰水泥在水化的最初几个小时内的化学相互作用。结果证实，EVA在pH碱性下水解并消耗溶液中的钙离子，形成有机盐（醋酸钙）。降低氢氧化钙含量。而且，它的相互作用发生在水合的前 15 分钟。 (C) 2009 Elsevier Ltd. 保留所有权利。
Ethylene/vinyl acetate (EVA) copolymer. as latex or redispersable powder, is added to mortars and concrete to improve the fracture toughness, impermeability and bond strength to various substrates. The physical and chemical interactions were already proved after one day of hydration but during the first hour just the physical interaction was identified and some evidences of a chemical interaction. The aim of this paper was to evaluate the chemical interaction between EVA and Portland cement during the first hours of hydration in the thermogravimetric analysis. The results confirmed that the EVA hydrolyses in pH alkaline and consumes calcium ions from the solution, forming an organic salt (calcium acetate). reducing the calcium hydroxide content. And, its interaction occurred in the first 15 min of hydration. (C) 2009 Elsevier Ltd. All rights reserved.